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<head><meta charset="utf-8"><title>I-prioritize #79902 regression 1.49: unexpected unsized tai… · t-compiler/wg-prioritization/alerts · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/index.html">t-compiler/wg-prioritization/alerts</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379902.20regression.201.2E49.3A.20unexpected.20unsized.20tai.E2.80.A6.html">I-prioritize #79902 regression 1.49: unexpected unsized tai…</a></h3>

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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379902%20regression%201.49%3A%20unexpected%20unsized%20tai%E2%80%A6/near/219486596" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379902.20regression.201.2E49.3A.20unexpected.20unsized.20tai.E2.80.A6.html#219486596">(Dec 10 2020 at 15:23)</a>:</h4>
<p><span class="user-group-mention" data-user-group-id="3111">@WG-prioritization/alerts</span> issue <a href="https://github.com/rust-lang/rust/issues/79902">#79902</a> has been requested for prioritization.</p>
<h1><a href="https://forge.rust-lang.org/compiler/prioritization/procedure.html#assign-priority-to-unprioritized-issues-with-i-prioritize-label">Procedure</a></h1>
<ul>
<li>Priority?</li>
<li>Regression?</li>
<li>Notify people/groups?</li>
<li>Needs <code>I-nominated</code>?</li>
</ul>



<a name="220137366"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379902%20regression%201.49%3A%20unexpected%20unsized%20tai%E2%80%A6/near/220137366" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> apiraino <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379902.20regression.201.2E49.3A.20unexpected.20unsized.20tai.E2.80.A6.html#220137366">(Dec 16 2020 at 16:24)</a>:</h4>
<p><span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span> also this one needs an evaluation. I can't get enough context on this one.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379902%20regression%201.49%3A%20unexpected%20unsized%20tai%E2%80%A6/near/220137367" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> apiraino <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379902.20regression.201.2E49.3A.20unexpected.20unsized.20tai.E2.80.A6.html#220137367">(Dec 16 2020 at 16:24)</a>:</h4>
<p>Curiously I've tried running on godbolt the snippet in this <a href="https://github.com/rust-lang/rust/issues/79902#issuecomment-744704197">comment</a> but i can't  reproduce the ICE on any Rust version.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379902%20regression%201.49%3A%20unexpected%20unsized%20tai%E2%80%A6/near/220138084" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Joshua Nelson <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379902.20regression.201.2E49.3A.20unexpected.20unsized.20tai.E2.80.A6.html#220138084">(Dec 16 2020 at 16:29)</a>:</h4>
<p><span class="user-mention" data-user-id="250987">@apiraino</span> I think the MCVE is not an ICE, just showing that the compiler is doing something wrong</p>



<a name="220138114"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379902%20regression%201.49%3A%20unexpected%20unsized%20tai%E2%80%A6/near/220138114" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Joshua Nelson <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379902.20regression.201.2E49.3A.20unexpected.20unsized.20tai.E2.80.A6.html#220138114">(Dec 16 2020 at 16:29)</a>:</h4>
<p>the ICE is while compiling a large crate: <a href="https://crater-reports.s3.amazonaws.com/beta-1.49-1/beta-2020-11-26/gh/folex.libp2p-multilang/log.txt">https://crater-reports.s3.amazonaws.com/beta-1.49-1/beta-2020-11-26/gh/folex.libp2p-multilang/log.txt</a></p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379902%20regression%201.49%3A%20unexpected%20unsized%20tai%E2%80%A6/near/220139136" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> apiraino <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379902.20regression.201.2E49.3A.20unexpected.20unsized.20tai.E2.80.A6.html#220139136">(Dec 16 2020 at 16:36)</a>:</h4>
<p>ah ok I thought the snippet was _meant_ to reproduce the crash. So we need an actual mcve for this?</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379902%20regression%201.49%3A%20unexpected%20unsized%20tai%E2%80%A6/near/220183129" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379902.20regression.201.2E49.3A.20unexpected.20unsized.20tai.E2.80.A6.html#220183129">(Dec 16 2020 at 22:34)</a>:</h4>
<p>bumping this one too</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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